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<!DOCTYPE html>
<html lang="fr">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Math Solver - Version Gratuite</title>
    <link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.0.0-beta3/css/all.min.css" rel="stylesheet">
    <link href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.7.0/styles/atom-one-dark.min.css" rel="stylesheet">
    <style>
        :root {
            --primary-color: #4a6fa5;
            --secondary-color: #166088;
            --accent-color: #4fc3f7;
            --background-color: #f8f9fa;
            --text-color: #333;
            --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            --code-bg: #2c323c;
            --output-bg: #f1f8f9;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            margin: 0;
            padding: 0;
            background-color: var(--background-color);
            color: var(--text-color);
        }

        .container {
            max-width: 1000px;
            margin: 0 auto;
            padding: 20px;
        }

        header {
            text-align: center;
            padding: 20px 0;
            margin-bottom: 30px;
        }

        .logo {
            font-size: 2.5rem;
            font-weight: bold;
            color: var(--primary-color);
            margin-bottom: 10px;
        }

        .subtitle {
            font-size: 1.2rem;
            color: var(--secondary-color);
            margin-bottom: 20px;
        }

        .content-box {
            background-color: white;
            border-radius: 10px;
            box-shadow: var(--box-shadow);
            padding: 30px;
            margin-bottom: 30px;
            text-align: center;
        }

        h1 {
            color: var(--primary-color);
            margin-top: 0;
        }

        .feature-list {
            list-style-type: none;
            padding: 0;
            margin: 30px 0;
            text-align: left;
        }

        .feature-list li {
            padding: 10px 0;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
        }

        .feature-list i {
            color: var(--accent-color);
            margin-right: 10px;
            font-size: 1.2rem;
        }

        .cta-button {
            display: inline-block;
            background-color: var(--primary-color);
            color: white;
            padding: 12px 25px;
            border-radius: 5px;
            text-decoration: none;
            font-weight: bold;
            transition: all 0.3s ease;
            margin: 20px 10px;
            border: none;
            cursor: pointer;
        }

        .cta-button:hover {
            background-color: var(--secondary-color);
            transform: translateY(-2px);
            box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
        }

        .upgrade-section {
            margin-top: 30px;
            padding: 20px;
            border-top: 1px solid #ddd;
        }

        footer {
            text-align: center;
            padding: 20px 0;
            color: #666;
            font-size: 0.9rem;
        }

        #solution {
            background: #fff;
            padding: 20px;
            border-radius: 8px;
            text-align: left;
            line-height: 1.8;
            font-size: 16px;
            /* Allow child divs to handle their own background */
             background-color: transparent;
             padding: 0; /* Remove padding if children manage it */
        }

        .step-section, .code-section, .output-section {
            margin: 0;
            padding: 15px;
            border-radius: 0;
            border-left: none;
            overflow-x: auto;
            white-space: pre-wrap; /* Important for text formatting */
             /* Common background or let specifics override */
            background-color: #f9f9f9;
        }

        .step-section {
             border-left: 4px solid var(--primary-color);
             padding-left: calc(15px - 4px);
             background-color: #f9f9f9; /* Specific background for steps */
        }


        .code-section {
             /* Code section manages its background via children */
             background-color: transparent;
             padding: 0; /* No padding on the container itself */
             border-left: none; /* Override general rule */
        }

        .code-header {
             background-color: #343a40;
             color: white;
             padding: 8px 15px;
             font-size: 14px;
             font-family: 'Courier New', monospace;
             display: flex;
             justify-content: space-between;
             align-items: center;
             border-top-left-radius: 0px; /* Managed by first-child rule */
             border-top-right-radius: 0px;
         }

        .code-content {
            margin: 0;
            padding: 15px;
            background-color: var(--code-bg);
            color: #e6e6e6;
            overflow-x: auto;
            font-family: 'Courier New', monospace;
            font-size: 14px;
            line-height: 1.5;
            border-bottom-left-radius: 0px; /* Managed by last-child rule */
            border-bottom-right-radius: 0px;
        }

        .output-section {
            background-color: var(--output-bg);
            padding: 15px;
            border-top: 1px solid #ddd;
            color: #333;
            font-family: 'Courier New', monospace;
            font-size: 14px;
            white-space: pre-wrap;
            overflow-x: auto;
            border-left: none; /* Override general rule */
            border-bottom-left-radius: 0px; /* Managed by last-child rule */
            border-bottom-right-radius: 0px;
        }

        /* Add border-radius back to the very first and very last child inside #solution */
        #solution > div:first-child,
        #solution > div:first-child .code-header {
             border-top-left-radius: 8px;
             border-top-right-radius: 8px;
        }

        #solution > div:last-child,
        #solution > div:last-child .code-content, /* If last element is code */
        #solution > div:last-child.output-section /* If last element is output */
         {
             border-bottom-left-radius: 8px;
             border-bottom-right-radius: 8px;
        }
         /* Ensure bottom radius on code content only if it IS the last element */
         #solution > .code-section:last-child .code-content {
            border-bottom-left-radius: 8px;
            border-bottom-right-radius: 8px;
         }
         /* If output follows code, remove bottom radius from code content */
         #solution > .code-section:not(:last-child) .code-content {
             border-bottom-left-radius: 0;
             border-bottom-right-radius: 0;
         }


        .latex-display {
            overflow-x: auto;
            padding: 10px 0;
            margin: 15px 0;
            text-align: center;
        }

        .thinking-indicator, .executing-indicator, .answering-indicator {
            display: flex;
            align-items: center;
            padding: 10px;
            margin: 10px 20px; /* Add margin to separate from content box */
            border-radius: 8px;
            font-size: 0.9rem;
        }

        .thinking-indicator { background-color: #e3f2fd; color: #1565c0; }
        .executing-indicator { background-color: #ede7f6; color: #5e35b1; }
        .answering-indicator { background-color: #e8f5e9; color: #2e7d32; }

        .indicator-icon { margin-right: 10px; animation: pulse 1.5s infinite ease-in-out; }
        @keyframes pulse { 0% { opacity: 0.6; } 50% { opacity: 1; } 100% { opacity: 0.6; } }

        mjx-container { overflow-x: auto; overflow-y: hidden; display: block; margin: 1em 0; text-align: initial; padding: 0 !important; }
        mjx-assistive-mml { display: none !important; }
        .MathJax nobr,.MathJax .mjx-chtml{ display: inline-block !important; white-space: normal !important; }
        .step-section span.MathJax_Preview { display: none !important; }

    </style>
</head>
<body>
    <div class="container">
        <header>
            <div class="logo">Math Solver</div>
            <div class="subtitle">La solution intelligente pour vos problèmes mathématiques</div>
        </header>

        <div class="content-box">
            <h1>Version Gratuite</h1>
            <p>Vous utilisez actuellement la version gratuite de Math Solver qui vous permet de résoudre 3 problèmes par jour.</p>

            <div class="feature-list">
                <h2>Fonctionnalités disponibles :</h2>
                <ul class="feature-list">
                    <li><i class="fas fa-check-circle"></i> Résolution de problèmes mathématiques basiques</li>
                    <li><i class="fas fa-check-circle"></i> 3 résolutions gratuites par jour</li>
                    <li><i class="fas fa-check-circle"></i> Explication des étapes de résolution</li>
                    <li><i class="fas fa-times-circle"></i> <span style="color: #999;">Mode d'exécution de code avancé (version Pro)</span></li>
                    <li><i class="fas fa-times-circle"></i> <span style="color: #999;">Résolutions illimitées (version Pro)</span></li>
                    <li><i class="fas fa-times-circle"></i> <span style="color: #999;">Support prioritaire (version Pro)</span></li>
                </ul>
            </div>

            <div class="upload-section">
                <form id="imageForm" enctype="multipart/form-data">
                    <input type="file" id="imageInput" name="image" accept="image/*" style="display: none;">
                    <button type="button" id="uploadButton" class="cta-button" onclick="document.getElementById('imageInput').click()">
                        <i class="fas fa-upload"></i> Télécharger une image
                    </button>
                </form>

                <p id="uploadStatus"></p>
                <div id="imagePreview" style="display: none; margin: 20px auto; max-width: 500px;">
                    <img id="preview" style="width: 100%; border-radius: 8px; box-shadow: var(--box-shadow);">
                </div>

                <button id="solveButton" class="cta-button" style="display: none; background-color: var(--secondary-color);">
                    <i class="fas fa-calculator"></i> Résoudre ce problème
                </button>
            </div>

            <div id="solutionOutput" style="margin-top: 30px; text-align: left; display: none;">
                <h3>Solution :</h3>
                <div id="loadingIndicator" class="thinking-indicator" style="display: none;">
                    <i class="fas fa-brain indicator-icon"></i>
                    <span>Je réfléchis au problème...</span>
                </div>
                 <!-- Container for the dynamically added content blocks -->
                <div id="solution" style="background: #fff; border-radius: 8px; overflow: hidden;">
                    <!-- Content will be added here by JS -->
                </div>
            </div>

            <div class="upgrade-section">
                <h2>Besoin de plus de puissance ?</h2>
                <p>Passez à la version Pro pour des fonctionnalités avancées et des résolutions illimitées.</p>
                <a href="#" class="cta-button">Passer à la version Pro</a>
            </div>
        </div>

        <footer>
            <p>© 2025 Math Solver. Tous droits réservés.</p>
        </footer>
    </div>

    <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.7.0/highlight.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.7.0/languages/python.min.js"></script>

    <script>
        window.MathJax = {
            tex: {
                inlineMath: [['$', '$'], ['\\(', '\\)']],
                displayMath: [['$$', '$$'], ['\\[', '\\]']],
                processEscapes: true,
                processEnvironments: true,
                packages: {'[+]': ['ams', 'noerrors', 'physics', 'cancel', 'color', 'mhchem', 'mathtools']} // "Full options" packages
            },
            options: {
                enableMenu: false,
                ignoreHtmlClass: 'code-content', // Don't process code
                processHtmlClass: 'step-section|latex-display', // Process text/latex sections
                skipHtmlTags: ['script', 'noscript', 'style', 'textarea', 'pre', 'code']
            },
            loader: {
                load: ['[tex]/ams', '[tex]/noerrors', '[tex]/physics', '[tex]/cancel', '[tex]/color', '[tex]/mhchem', '[tex]/mathtools']
            },
            svg: {
                fontCache: 'global' // Good for performance
            }
        };
    </script>
    <script id="MathJax-script" async src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/3.2.2/es5/tex-svg.js"></script>

    <script>
        document.getElementById('imageInput').addEventListener('change', function(event) {
            const file = event.target.files[0];
            if (file) {
                const reader = new FileReader();
                reader.onload = function(e) {
                    document.getElementById('preview').src = e.target.result;
                    document.getElementById('imagePreview').style.display = 'block';
                    document.getElementById('solveButton').style.display = 'inline-block';
                    document.getElementById('uploadStatus').textContent = `Image sélectionnée : ${file.name}`;
                }
                reader.readAsDataURL(file);
            }
        });

        document.getElementById('solveButton').addEventListener('click', function() {
            const formData = new FormData(document.getElementById('imageForm'));
            const solutionOutput = document.getElementById('solutionOutput');
            const loadingIndicator = document.getElementById('loadingIndicator');
            const solutionContainer = document.getElementById('solution'); // Target the inner container

            solutionOutput.style.display = 'block';
            loadingIndicator.style.display = 'flex';
            solutionContainer.innerHTML = ''; // Clear previous solution

            fetch('/solved', { // Ensure this endpoint exists and processes the image
                method: 'POST',
                body: formData
            })
            .then(response => {
                if (!response.ok) {
                    throw new Error(`Erreur serveur: ${response.statusText}`);
                }
                const reader = response.body.getReader();
                const decoder = new TextDecoder();
                let buffer = '';

                function processStream({ done, value }) {
                    if (done) {
                        loadingIndicator.style.display = 'none';
                        return;
                    }

                    buffer += decoder.decode(value, { stream: true });
                    // Split reliably by double newline, handling different line ending types
                    const lines = buffer.split(/\r?\n\r?\n/);
                    buffer = lines.pop(); // Keep potentially incomplete chunk

                    for (const line of lines) {
                        if (line.startsWith('data: ')) {
                            try {
                                const data = JSON.parse(line.substr(6));

                                if (data.mode) {
                                    // Update loading indicator (same as before)
                                    if (data.mode === 'thinking') { /* ... */ }
                                    else if (data.mode === 'answering') { /* ... */ }
                                    /* ... other modes ... */

                                     // Simpler indicator update
                                     const modes = {
                                         thinking: { icon: 'fa-brain', text: 'Je réfléchis...', class: 'thinking-indicator' },
                                         answering: { icon: 'fa-pencil-alt', text: 'Rédaction...', class: 'answering-indicator' },
                                         executing_code: { icon: 'fa-code', text: 'Exécution...', class: 'executing-indicator' },
                                         code_result: { icon: 'fa-terminal', text: 'Résultats...', class: 'executing-indicator' }
                                     };
                                     const modeInfo = modes[data.mode];
                                     if (modeInfo) {
                                         loadingIndicator.className = modeInfo.class;
                                         loadingIndicator.innerHTML = `<i class="fas ${modeInfo.icon} indicator-icon"></i><span>${modeInfo.text}</span>`;
                                     }
                                }

                                if (data.content) {
                                    const content = data.content;
                                    // Create a temporary div to parse the potential HTML structure from content
                                    const tempDiv = document.createElement('div');
                                    tempDiv.innerHTML = content; // Let browser parse potential HTML within content

                                    // Check if content contains a code block structure
                                    const codeSection = tempDiv.querySelector('.code-section');
                                    const outputSection = tempDiv.querySelector('.output-section');

                                    if (codeSection) {
                                        // It's a code block, append it directly
                                        solutionContainer.appendChild(codeSection);
                                        // Highlight the code within the appended section
                                        codeSection.querySelectorAll('pre code').forEach((block) => {
                                            hljs.highlightElement(block);
                                        });
                                    } else if (outputSection) {
                                         // It's an output block
                                         solutionContainer.appendChild(outputSection);
                                    }
                                    else {
                                        // Assume it's a regular text/LaTeX step section
                                        const stepDiv = document.createElement('div');
                                        stepDiv.className = 'step-section';
                                        // Use innerHTML to correctly interpret potential entities from JSON string
                                        stepDiv.innerHTML = content;
                                        solutionContainer.appendChild(stepDiv);
                                        // Typeset MathJax for this specific new section
                                        MathJax.typesetPromise([stepDiv]).catch(e => console.error('MathJax typesetting error:', e));
                                    }
                                }


                                if (data.error) {
                                    const errorDiv = document.createElement('div');
                                     errorDiv.className = 'step-section'; // Style like other steps
                                     errorDiv.style.color = 'red';
                                     errorDiv.style.backgroundColor = '#ffeeee';
                                     errorDiv.style.borderColor = 'red';
                                     errorDiv.textContent = `Erreur: ${data.error}`;
                                    solutionContainer.appendChild(errorDiv);
                                    loadingIndicator.style.display = 'none';
                                }
                            } catch (e) {
                                console.error('Error parsing JSON or processing chunk:', e, line);
                                // Optionally display a generic error message chunk
                                const errorDiv = document.createElement('div');
                                errorDiv.className = 'step-section'; errorDiv.style.color = 'orange';
                                errorDiv.textContent = `Erreur traitement chunk: ${line.substring(0, 100)}...`;
                                solutionContainer.appendChild(errorDiv);
                            }
                        }
                    }

                    window.scrollTo(0, document.body.scrollHeight);
                    return reader.read().then(processStream);
                }

                return reader.read().then(processStream);
            })
            .catch(error => {
                const errorDiv = document.createElement('div');
                errorDiv.className = 'step-section'; // Style like other steps
                errorDiv.style.color = 'red';
                errorDiv.style.backgroundColor = '#ffeeee';
                errorDiv.style.borderColor = 'red';
                errorDiv.textContent = `Erreur de connexion ou du serveur: ${error}`;
                solutionContainer.appendChild(errorDiv); // Append error inside the solution area
                loadingIndicator.style.display = 'none';
                console.error('Fetch error:', error);
            });
        });
    </script>
</body>
</html>